From: Eric Sandeen Subject: Re: how to scale root-reserved space going forward... Date: Mon, 02 Mar 2009 10:26:21 -0600 Message-ID: <49AC08AD.7050602@redhat.com> References: <49AB0ABE.1030009@redhat.com> <20090302024754.GF6973@mit.edu> <20090302085632.GM3199@webber.adilger.int> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Theodore Tso , ext4 development To: Andreas Dilger Return-path: Received: from mx2.redhat.com ([66.187.237.31]:48223 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751289AbZCBQ0a (ORCPT ); Mon, 2 Mar 2009 11:26:30 -0500 In-Reply-To: <20090302085632.GM3199@webber.adilger.int> Sender: linux-ext4-owner@vger.kernel.org List-ID: Andreas Dilger wrote: > I suspect that at a certain filesystem size, there isn't much benefit > in having more reserved space. If we keep 50GB of reserved space then > this is likely to contain a decent amount of 1MB free chunks, which is > what we really care about. > > Cheers, Andreas As long as we don't care much about inode<->block locality, that is probably ok... I got one off-list reply from someone who was depending on the 5% for administration reasons, but even if we change the default I assume we'll leave the tunable in place for people who really do want 5% for "root-reserved" over "allocator safety buffer" reasons. -Eric